Prove that (cosA - cosB) / (sinA + sinB) = ( sinB - sinA ) / ( cosA + cosB )

Jaya Legge 2021-02-15 Answered
Prove that cosAcosBsinA+sinB=sinBsinAcosA+cosB
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Expert Answer

Nathaniel Kramer
Answered 2021-02-16 Author has 78 answers
Cross-multiply:
cos2Acos2B=sin2Bsin2A=1cos2B(1cos2A)=cos2Acos2B,
which is an identity, proving the original equivalence.

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